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Adaptive on-off control for radio receiver

  • US 5,309,153 A
  • Filed: 03/13/1991
  • Issued: 05/03/1994
  • Est. Priority Date: 11/27/1985
  • Status: Expired due to Term
First Claim
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1. A radio paging receiver for a paging system which transmits signals from a transmitter to said paging receiver according to a time slot protocol, said radio paging receiver including,periodically active radio circuit means which is periodically active for short periods of time to receive signals from said transmitter,an internal timing reference in said radio circuit for generating an internal timing reference signal,means for generating first timing signals from said internal timing reference signals,means responsive to said first timing signals for controlling the interval during which said radio circuit means is active and the interval during which said radio circuit means is inactive,means for deriving a second timing signal each time said radio circuit means is active, said second timing signal being derived from said signal transmitted by said transmitter,means for modifying the relationship between said internal timing reference and said first timing signals if the sum of sequentially accruing active and inactive periods of said radio circuit means do not equal the time interval between sequential ones of said second timing signals,whereby the activation of said radio circuit means in said paging receiver is synchronized with the transmission from said transmitter.

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